Below is a list of Thornton CA zip codes. For your research we have also included Thornton Area Code, Time Zone, UTC and the local San Joaquin County FIPS Code. Each Thornton California zip code has a center Longitude / Latitude point (the Thornton center is -121.42800140381 / 38.226100921631). For your convenience we have also indicated if that zip code in Thornton observes Daylight Savings time.